Because her eyes were closed, Alice was taken by surprise when she felt the pain in her nipples. She opens her eyes en makes a soft shocked sound, but smiles to make sure Victoria continues... and then, well let's say Alice isn't used to clamps.
With clenched teeth Alice follows Victoria with her eyes. She's happy to see the flogger, only because she knew the pain in her nipples would feel less painful when she got hit on her back. And she did twitch.
After some strikes Alice bites on her lips, wondering if pain could be variated with gentle gestures of love, there is so much to learn... but she didn't want to dissappoint Victoria on her first day, so she just suffers the pain.
In the right line of thought, I might start to like the harder work as well, she thought to give herself some hope.